/Engine/Source/Editor/UnrealEd/Classes/Editor/UnrealEdEngine.h
Go through a map of BSP and make only the requested objects visible.
virtual void MakeBSPMapVisible ( const [TMap](API\Runtime\Core\Containers\TMap)< [AActor](API\Runtime\Engine\GameFramework\AActor) *, [TArray](API\Runtime\Core\Containers\TArray)< int32 >> & InBSPMap, [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld )